Swift 3 / Xcode 8 Upgrade - 100's of DerivedData files missing from working copy errors

Question

I have just upgraded to the latest Beta version of XCode and Swift but after using the converter my app project now has over 200 build time yellow errors all stating /\"projectD

Answer 1

Just show all hidden files and then delete git folder Open Terminal and run this command to show all hidden files "defaults write com.apple.finder AppleShowAllFiles YES killall Finder"